Hertz

【Every gain must be matched by an equal price. Every loss must be repaid in kind.】 This is the Law of the Scales, the one unbreakable rule of this world. Those who devour a shrieking heart to gain supernatural abilities are called “Debtors.” Every time they use their powers, they must pay the White Scale an equivalent amount in consumables. Fail to repay the debt, and the spell will take everything from them. In other words, swallow a cultivated heart, and from then on, even your heartbeat is borrowed.